<html>
  <head>
    <style>
      #s2::before { 
        content: "a";
        position: absolute; 
      }
      #s1 {
        overflow: -moz-hidden-unscrollable;
      }
      #s3 {
        position: relative;
      }
      #s5 {
        position: absolute;
      }
    </style>
  </head>
  <body>
    <strike id="s1">
    <strike id="s2">
    <small id="s3">
      <div>
        <div id="s4"></div>
        </strike>
      </div>
  </body>
</html>

